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Adjective: grievous  gree-vus
  1. Causing fear or anxiety by threatening great harm
    "grievous bodily harm";
    - dangerous, grave, serious, severe, life-threatening
  2. Causing or marked by grief or anguish
    "a grievous loss";
    - heartbreaking, heartrending
  3. Of great gravity or crucial import; requiring serious thought
    "a grievous fault";
    - grave, heavy, weighty
  4. Shockingly brutal or cruel
    "a grievous offence against morality";
    - atrocious, flagitious, monstrous

See also: critical, evil, important, of import, sorrowful

Encyclopedia: Grievous